Isaiah 49:4

But I said, “I have labored in vain, I have spent My strength in futility and vanity; yet My vindication is with the Lord, and My reward is with My God.”
BSB · Berean Standard Bible
Then I said, I have laboured in vain, I have spent my strength for nought, and in vain: yet surely my judgment is with the Lord, and my work with my God.

Note my work: or, my reward

KJV · King James Version
But I said, “I have labored in vain. I have spent my strength in vain for nothing; yet surely the justice due to me is with the Lord, and my reward with my God.”
WEB · World English Bible
But I said, I have labored in vain, I have spent my strength for nought and vanity; yet surely the justice due to me is with Jehovah, and my recompense with my God.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

I have laboured
Isaiah 65:2; Ezekiel 3:19; Matthew 17:17; Matthew 23:37; John 1:11; Romans 10:21; Galatians 4:11
spent
Leviticus 26:20; 2 Corinthians 12:15
yet
Isaiah 53:10–12; Psalm 22:22–31; Luke 24:26; John 17:4, 5; 2 Corinthians 2:15; Philippians 2:9, 10; Hebrews 12:2
work
or, reward.
Isaiah 40:10; Isaiah 62:11